Cyclic Behavior of Low Rise Concrete Shear Walls Containing Recycled Coarse and Fine Aggregates.

Wenwen Zhang,Wenchao Liu,Zhiwei Qian,Xiangyu Li,Wanlin Cao,Qiyun Qiao

doi:10.3390/ma10121400

Abstract

In this study, the cyclic behaviors of low rise concrete shear walls using recycled coarse or fine aggregates were investigated. Eight low rise Recycled Aggregates Concrete (RAC) shear wall specimens were designed and tested under a cyclic loading. The following parameters were varied: replacement percentages of recycled coarse or fine aggregates, reinforcement ratio, axial force ratio and X-shaped rebars brace. The failure characteristics, hysteretic behavior, strength and deformation capacity, strain characteristics and stiffness were studied. Test results showed that the using of the Recycled Coarse Aggregates (RCA) and its replacement ratio had almost no influence on the mechanical behavior of the shear wall; however, the using of Recycled Fine Aggregates (RFA) had a certain influence on the ductility of the shear wall. When the reinforcement ratio increased, the strength and ductility also increased. By increasing the axial force ratio, the strength increased but the ductility decreased significantly. The encased brace had a significant effect on enhancing the RAC shear walls. The experimental maximum strengths were evaluated with existing design codes, it was indicated that the strength evaluation of the low rise RAC shear walls can follow the existing design codes of the conventional concrete shear walls.

Highlights

With the development of urban construction and urbanization, concrete structures have been widely and rapidly constructed, especially in some developing countries
For specimen W8 with encased X-type rebars ignores the effect of web vertical reinforcing bras and only accounts for the amount of horizontal brace, the horizontal and vertical components of the brace were taken into consideration in the reinforcing bars, provides the minimum requirements for the seismic design of Reinforced Concrete (RC) shear walls
The shear wall specimen fractured in shear domain mode, characterized by the diagonal cracks and crushing and spalling of the concrete

Summary

Introduction

With the development of urban construction and urbanization, concrete structures have been widely and rapidly constructed, especially in some developing countries. The shortage of resources, such as the nature coarse or fine aggregates is becoming an urgent matter. A huge amount of the construction and demolition wastes are generated due to the limitation of the structure life span or the natural hazards. Among these construction wastes, the concrete construction waste causes extremely serious environment problems. Concrete industry is responsible of the most significant contribution to the global warming due to the large amount of substances with environmental impacts produced during its entire life cycle (production process, construction, maintenance, dismantlement, and scrapping). The most important issue characterizing the concrete industry is related to the constant growth of consumption of natural aggregates.

Methods

Results

Conclusion